Dental plate or denture



1. WILLIAM S.

DENTAL PLATE 0R DENTURE.

APPLICATION FILED OCT. 14, I918.

EI EEI J67; "47/1221713 29y Qn MW Patented May 11,1920.

JOHN WILLIAMS, 0F LIVERPOOL, ENGLAND.

DENTAL PLATE OR DENTUBE.

Specification of Letters Patent.

Patented May 11, 1920.

Application filed October 14, 1918. Serial No. 258,008.

To all whom it may concern:

Be it known that I, JOHN WILLIAMS, a subject of the King of Great Britain, residing at Liverpool, in the county of Lancaster and Kingdom of England, have invented certain new and useful Improvements in Dental Plates or Dentures, of which the following is a specification.

This invention has reference to dental plates or dentures and the object of the invention is to provide improved means for holding the suction diaphragm in place.

The invention is characterized by this that the palate of the hard vulcanite plate or denture has formed in it an aperture which however is closed at the bottom by a pliable diaphragm so as to leave a chamber between the diaphragm and the roof of the wearers mouth, and as above noted the invention has reference more particularly to a new means for securing the diaphragm in place.'

The invention will be understood from the following description reference being had to the accompanying drawing in which a denture plate or denture is shown in cross section, element case.

In this drawing A is the plate of a hard vulcanite plate or denture in which is formed an aperture such as B. This aperture B is closed at the bottom by the flexible rubber diaphragm C so that the said aperture forms a chamber D with a pliable or elastic floor, and if the air be exhausted from this chamber either by suction from above or by pressure upon the under side of the diaphragm the air above the chamber will become so rarefied that the elastic diaphragm will belly upward or against the roof of the mouth.

forming the basis of the present having applied thereto the suction 1 Within the aperture there is secured a cap or ferrule E having an inwardl projecting ledge E, the said cap or errule being fixed permanently in the aperture so that it can not become detached from the vulcanite plate. This cap or ferrule may be inserted and secured in the aperture either before or after vulcanization of the plate A. The diaphragm C is inserted from above this cap so as to rest on the ledge E, and is clamped and held in position by a piece of spring wire F which extends entirely around the edge,'as shown in the drawing.

The act of deglutition serves constantly to cause a rarefication of the air in the chamber D above the diaphragm C to be maintained, thus inducing a bellying upward of the diaphragm. The tendency of the rubber diaphragm to resume its normal or unbellied condition, induces a suction which holds the vulcanite plate in position namely in close contact or contiguity to the roof of the mouth.

I declare that what I claim is A dental plate or denture, comprising a "ulcanite palate, an aperture formed in it, a cap or ferrule having an inwardly projecting ledge secured in the said aperture, a rubber diaphragm inserted from above into this cap so as to rest on the ledge, and a piece of spring wire clamping the edge of the diaphragm on the ledge.

In witness whereof I have hereunto signed my name this 16th day of Sept, 1918, in the presence of two subscribing witnesses.

JOHN WILLIAMS.

Witnesses:

G. C. DYMOND, J. MOLAOHLAN. 

